这次偶遇完全是巧合，我们都没料到会在机场碰见对方。

Our encounter at the airport was entirely ___fortuitous, as neither of us planned to be there.

我们在雨中偶遇一家温馨的咖啡馆，真是幸运。

Our ___fortuitous encounter with a cozy cafe in the rain was truly lucky.